How to check if we are in the init hook?

You can use did_action to test for this, e.g.:

if ( did_action( 'init' ) < 1 ) {
    // init has not ran yet! Throw the exception
}

https://developer.wordpress.org/reference/functions/did_action/

did_action returns the number of times that action has been run. This can also be used to ensure it only happens once for filters that happen multiple times, e.g. using === 1 for the first time it runs

You can also use doing_action to test if you are on the init hook:

if ( ! doing_action( 'init' ) ) {
    // only on init! throw an exception
}

https://developer.wordpress.org/reference/functions/doing_action/

You might also want to avoid exceptions, and instead consider using _doing_it_wrong

https://developer.wordpress.org/reference/functions/_doing_it_wrong/

This allows you to be more flexible while nudging the developer in the right direction for those situations where it needs to change, especially if this is a change in behaviour

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